Annual report pursuant to Section 13 and 15(d)

BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts receivable (Details)

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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts receivable (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts Receivable, after Allowance for Credit Loss [Abstract]      
Accounts receivable $ 4,950 $ 5,080  
Reserves (257) (176)  
Accounts receivable, net 4,693 4,904  
Accounts receivable $ 211 $ (2,698) $ (171)